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Tetrametallic molecular rectangles have been synthesized by combining rhenium(I) thiolate dimers with difunctional pyridyl and pyrazyl type ligands. The proposed rectangular structures are supported by 1H NMR, MS, and IR absorption measurements. In addition, crystal structures of two of the rectangles are presented showing frameworks with dimensions 3.81 × 11.57 and 3.69 × 7.22 Å, as defined by the rhenium atoms.
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Benkstein et al. (1998) studied this question.
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